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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.tuscany.sca.core.databinding.wire;
import java.util.List;
import org.apache.tuscany.sca.databinding.Mediator;
import org.apache.tuscany.sca.interfacedef.DataType;
import org.apache.tuscany.sca.interfacedef.InterfaceContract;
import org.apache.tuscany.sca.interfacedef.Operation;
import org.apache.tuscany.sca.invocation.InvocationChain;
import org.apache.tuscany.sca.runtime.RuntimeWire;
import org.apache.tuscany.sca.runtime.RuntimeWireProcessor;
/**
* This processor is responsible to add an interceptor to invocation chain if
* the source and target operations have different databinding requirements
*
* @version $Rev$ $Date$
*/
public class DataBindingRuntimeWireProcessor implements RuntimeWireProcessor {
private Mediator mediator;
public DataBindingRuntimeWireProcessor(Mediator mediator) {
super();
this.mediator = mediator;
}
public boolean isTransformationRequired(DataType source, DataType target) {
if (source == null || target == null) { // void return type
return false;
}
if (source == target) {
return false;
}
// Output type can be null
if (source == null && target == null) {
return false;
} else if (source == null || target == null) {
return true;
}
String sourceDataBinding = source.getDataBinding();
String targetDataBinding = target.getDataBinding();
if (sourceDataBinding == targetDataBinding) {
return false;
}
if (sourceDataBinding == null || targetDataBinding == null) {
// TODO: If any of the databinding is null, then no transformation
return false;
}
return !sourceDataBinding.equals(targetDataBinding);
}
public boolean isTransformationRequired(Operation source, Operation target) {
if (source == target) {
return false;
}
// Check output type
DataType sourceOutputType = source.getOutputType();
DataType targetOutputType = target.getOutputType();
// Note the target output type is now the source for checking
// compatibility
if (isTransformationRequired(targetOutputType, sourceOutputType)) {
return true;
}
List<DataType> sourceInputType = source.getInputType().getLogical();
List<DataType> targetInputType = target.getInputType().getLogical();
int size = sourceInputType.size();
for (int i = 0; i < size; i++) {
if (isTransformationRequired(sourceInputType.get(i), targetInputType.get(i))) {
return true;
}
}
return false;
}
private boolean isTransformationRequired(InterfaceContract sourceContract,
Operation sourceOperation,
InterfaceContract targetContract,
Operation targetOperation) {
if (targetContract == null) {
targetContract = sourceContract;
}
if (sourceContract == targetContract) {
return false;
}
return isTransformationRequired(sourceOperation, targetOperation);
}
public void process(RuntimeWire wire) {
InterfaceContract sourceContract = wire.getSource().getInterfaceContract();
InterfaceContract targetContract = wire.getTarget().getInterfaceContract();
if (targetContract == null) {
targetContract = sourceContract;
}
if (sourceContract == targetContract) {
return;
}
List<InvocationChain> chains = wire.getInvocationChains();
for (InvocationChain chain : chains) {
Operation sourceOperation = chain.getSourceOperation();
Operation targetOperation = chain.getTargetOperation();
if (isTransformationRequired(sourceContract, sourceOperation, targetContract, targetOperation)) {
// Add the interceptor to the source side because multiple
// references can be wired
// to the same service
DataTransformationInteceptor interceptor = new DataTransformationInteceptor(wire, sourceOperation,
targetOperation);
interceptor.setMediator(mediator);
chain.addInterceptor(0, interceptor);
}
}
}
}
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